基于HgCdTe结构拓扑相的表观PT对称太赫兹光电导率

Apparent PT-symmetric terahertz photoconductivity in the topological phase of HgCdTe-based structures.

作者信息

Galeeva A V, Kazakov A S, Artamkin A I, Ryabova L I, Dvoretsky S A, Mikhailov N N, Bannikov M I, Danilov S N, Khokhlov D R

机构信息

Physics Department, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia.

Chemistry Department, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia.

出版信息

Sci Rep. 2020 Feb 11;10(1):2377. doi: 10.1038/s41598-020-59280-0.

DOI:10.1038/s41598-020-59280-0

PMID:32047201

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7012871/

Abstract

We show that the terahertz (THz) photoconductivity in the topological phase of HgCdTe-based structures exhibits the apparent PT- (parity-time) symmetry whereas the P-symmetry and the T-symmetry, separately, are not conserved. Moreover, it is demonstrated that the P- and T-symmetry breaking may not be related to any type of the sample anisotropy. This result contradicts the apparent symmetry arguments and means that there exists an external factor that interacts with the sample electronic system and breaks the symmetry. We show that deviations from the ideal experimental geometry may not be such a factor.

摘要

我们表明，基于HgCdTe的结构在拓扑相中的太赫兹（THz）光电导率表现出明显的宇称-时间（PT）对称性，而单独的宇称（P）对称性和时间反演（T）对称性并不守恒。此外，已证明P和T对称性破缺可能与任何类型的样品各向异性无关。这一结果与明显的对称性观点相矛盾，意味着存在一个与样品电子系统相互作用并破坏对称性的外部因素。我们表明，偏离理想实验几何结构可能不是这样一个因素。